WorksheetsMEC241-CH1
Total questions: 15
Worksheet time: 8mins
As a consequence of the continuum assumption, each fluid property is assumed to have a definite value at every point in space.
True
False
Which of the following best describes the difference between the Lagrangian and Eulerian approaches to fluid motion?
A) Lagrangian follows individual fluid particles, Eulerian focuses on a control volume
B) Lagrangian focuses on a control volume, Eulerian follows individual fluid particles
C) Both follow individual fluid particles
D) Both focus on a control volume
Streamlines are useful as indicators of the __________ throughout the flow field.
instantaneous direction of fluid motion
velocity magnitude
pressure distribution
temperature gradient
Fluid within a streamtube must remain there and cannot cross the boundary of the streamtube.
True
False
What is a pathline?
The shortest distance between two points in a fluid
The actual path traveled by an individual fluid particle over some time period
The average velocity of a fluid particle
The direction of fluid flow
A pathline is a ________ concept in that we simply follow the path of an individual fluid particle as it moves around in the flow field.
Lagrangian
Eulerian
Bernoulli
Reynolds
If you insert a small tube into a flow and introduce a continuous stream of tracer fluid (dye in a water flow or smoke in an air flow), what observed pattern is formed?
Pathline
Streakline
Streamline
Vortex line
True or False: Streaklines, streamlines, and pathlines are always identical, regardless of whether the flow is steady or unsteady.
True
False
What is a timeline in fluid mechanics?
A set of adjacent fluid particles that were marked at the same instant in time
A single fluid particle moving through a flow
The speed of a fluid at a point
The pressure difference in a fluid
What are viscous flows?
Flows in which the frictional effects are significant.
Flows in which the frictional effects are negligible.
Flows with no velocity profile.
Flows that only occur in gases.
What are inviscid flow regions?
Regions where viscous forces are significant compared to inertial or pressure forces.
Regions where viscous forces are negligibly small compared to inertial or pressure forces.
Regions close to solid surfaces.
Regions with no flow.
What is external flow?
The flow in a pipe or duct if the fluid is completely bounded by solid surfaces.
The flow of an unbounded fluid over a surface such as a plate, a wire, or a pipe.
The flow of liquids in a duct with a free surface.
The flow of air inside a closed room.
Water flow in a pipe is an example of:
External flow
Internal flow
Open-channel flow
None of the above
What is incompressible flow?
If the density of flowing fluid remains nearly constant throughout (e.g., liquid flow)
If the density of fluid changes during flow (e.g., high-speed gas flow)
If the temperature of fluid remains constant
If the pressure of fluid remains constant
What is compressible flow?
If the density of flowing fluid remains nearly constant throughout (e.g., liquid flow)
If the density of fluid changes during flow (e.g., high-speed gas flow)
If the temperature of fluid remains constant
If the pressure of fluid remains constant
